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Transcription and Regulation

Transcription and Regulation
Transcription factors are

TATA boxes
promoters
CATT boxes
proteins which bind to DNA and regulate transcription

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Transcription and Regulation
The binding of lac repressor to DNA could be considered to be analogous to

competitive inhibition of an enzyme
mixed-type inhibition of an enzyme
allosteric effects in enzyme regulation
uncompetitive inhibition of an enzyme

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Transcription and Regulation
Immediately after transcription

a methylated guanine cap is added to the 31 end of the transcript
a poly adenylation signal is added
both (a) and (b)
a methylated guanine cap is added to the 51 end of the transcript

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Transcription and Regulation
Each tRNA molecule has a cloverleaf secondary structure consisting of

three stem loops
four stem loops
two stem loops
either (a) or (b)

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Transcription and Regulation
Transcription results in

messenger RNA
complementary DNA
Okazaki fragments
an amino acid chain

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Transcription and Regulation
The RNA polymerases that transcribe bacterial DNA are

highly glycosylated in their active forms
multisubunit enzymes
interchangable with DNA polymerases
only active inside the cell

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